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affect created by the differential density likely caused VW3 (temporary extraction well) to be short <br /> circuited by the artificially enhanced flow through the adjacent subsurface body of pea gravel Data <br /> collected during this pilot test, therefore, is somewhat inconclusive, however, measured flow rates <br /> and contaminated vapors recovered during the test indicated that vapor extraction is likely a viable <br /> approach to site remediation <br /> The radius of influence was not determined because of the differential subsurface densities present <br /> between the extraction and two observation vapor wells, however, it is assumed that vapor wells will <br /> need to be spaced approximately 20 to 30 feet apart to attain an effective radius of influence <br /> TABLE 8 <br /> SOIL VAPOR EXTRACTION TEST RESULTS <br /> 1766 MONTE DIABLO AVENUE <br /> STOCKTON, CALIFORNIA <br /> Time Distance Distance Flow Applied Observed Observed <br /> (min) to VW2 to VW4 RPM Rate Vacuum Vacuum Vacuum <br /> feet feet) (cfn) (VW2) (VW4 <br /> VW3 <br /> 0 22 28 2300 262 00 002 003 <br /> 10 22 28 1800 262 010 002 003 <br /> 30 22 28 2400 283 09 0 025 003 <br /> 35 22 28 2400 283 010 0 025 003 <br /> Hiatus <br /> 0 22 28 2500 436 026 0 025 004 <br /> 20 22 28 2800 414 022 0 035 004 <br /> 50 22 28 3900 447 026 0 035 0 045 <br /> 80 22 28 4400 447 026 0 035 004 <br /> 110 22 28 4000 50 1 034 0 035 004 <br /> 140 22 28 3800 589 047 004 0 045 <br /> 170 22 28 3800 61 0 050 004 005 <br /> 200 22 28 3400 665 058 004 004 <br /> 202 22 28 2900 709 066 0 045 0 045 <br /> RPM=Revolutions per minute of the IC engine <br /> cfm= cubic feet per minute <br /> Vacuum Applied in inches of H2O <br /> Observed Vacuum in inches of H2O <br /> nm= not measured <br /> SEACOR 014-01-1 par 16 <br />